Matrix bar for type-line setting and casting machines



J. DORNETH Nov. 24, 1931.

MATRIX BAR FOR TYPE LINE SETTING AND CASTING MACHINES Filed March 9,1931 fiweziaior: $04M $1 M Patented Nov. 24, 1931 UNITED STATES PATENTOFFI'CHEIV-II JULIUS DORNETH, OF 'KONRALDSHOHE, NEAR TEGEL-BERLIN,TYPOGRAPH G. M. B. IL, OF BERLIN, GERMANY Y, ASSIGNOR 'ro MATRIX BAR FORTYPE-LINE SETTING AND, CASTING MACHINES Application filed March 9, 1931,Serial No.

This invention relates to a two-part matrix bar for type-line settingand casting machines with matrices suspended and guided on wires, theparts of which bearing the characters and the suspending eye areslidably arranged relatively to one another. A matrix bar the parts ofwhich can be pushed together and which is adapted for practical purposesmust fully comply with the hereinafter briefly enumerated conditions:The cross-section of the matrix bar must not be thicker or only veryslightly thicker at the point where the means for moving the bar isprovided than the crosssection of the steel part used in the hithertoadopted bar matrices, that is to say the cross section must in any eventbe less than the cross-section of the lower part bearing the charactersso that .when justifying the line the matrix bars cannot move apartradially upwards whichmay result in a jamming of the suspending eyes onthe guide wires and a bending of the matrixbarsa I v V, A matrix bar,the parts ofwhich are'adapt- 2 'ed to be pushed together, must be verystable so that a bending of the matrices cannot take place when settingand distributing the same and consequently a movement of the matrix baron to the bar at the setting point is prevented. However, such astability only exists when the parts of the matrix bar, which are movedrelatively to one another, are always guided during their movement withlarge surfaces longitudinally and transversely on many sides.

Notwithstanding the requisite stability, the guiding must, however, notbe effected. through the medium of surfaceswhichhave a too accurate fitand bear directly against 4 one another but there must exist a certainminimum play, in the plane of the matrix bar and also vertically theretofor otherwise the friction'may be so great that it would prevent theraising and lowering of the matrix bars. .Such an accurate fit wouldalso lead to a clamping or jamming owing to the unavoidable bending ofthe bar during the operation so that a movement of the -parts of thematrix would be impossible. However, it is essential that the parts of521,287, and in Germany October 9, 1930.

the matrix should be easily movable at any time. I However, in spite ofthe most accurate manufacture, a matrix'bar whose partsare adapted to bepushed together must not be more expensive than the ordinary-matrix bar,It must also be so designed that a movement of its parts cannot beeffected or prevented by any accumulation or depositof dirt; however, itmust be possible to effect a quicklamlthorough cleaning of the partswhich are hin- Cqered in their free movement by avdeposit of irt.Attempts have frequently been made in thecourse of time to find apractical solution for a matrix bar capable of being lengthened andshortened respectively, It is, however, a fact that none of these matrixbars has hitherto proved satisfactory in practice because none of themhas fully complied with the re quirements of 'a matrix bar, the parts ofwhich are adapted to be pushed together." None of the hitherto proposedsolutions has fulfilled the above enumerated conditions;

An attempt has hitherto been made to guide both movable parts togetherby an arrange,-

ment of slots and pins or use has been made of a sleeve closed on allsides for guiding the part of the bar movable therein. It has also beenproposed to mill a groove in the lower part of the bar from above andfrom its one narrow side which encloses the upper movable part on twobroad sides and one narrow side; the guiding of the movable part willthus be eflected not only'by the two broad sides of the groove but alsoby pin and slot inconnection with the closed part of the groove. 7

However, it has been'noticed during operation that a jamming of theparts of the matrix takes place in all cases where slot and pin areconically formed per se or are? made straight and are provided inconnection with a sleeve for guiding the relatively movable parts.Moreover, owingto the great wear and tear of the small contact pointso'f1 these pin and slot guides during operation, the play of the movableparts is increased to an inadmissible extent so that the parts moverelatively to one'another in the direction oftheir plane as well asvertically thereto whereby the jamming is again caused. With regard tothe arrangement of a guiding sleeve closed on all sides, it has beenfound that with this type, especially in the case of small charactersand the long thin matrix bars, the

cross section at the connecting place of the movable parts is too thickand consequently gives rise to the above-mentioned drawbacks. Regardlessof the complicated manufacture, such a sleeve which is closed on:allsides does not ensure an accurate guiding of the parts and the dirtwhich is deposited at these-con .necting places cannot be readilyremoved therefrom. The same drawbacks would be not ceable when usingaguiding sleeve which surrounds the movable part of the bar on two Theatbroadsidesand one narrow side. tempt to obviate these drawbacks byreplacing the special sleeve to be attached to a part of the bar bymilling a .groovein the latter from above and from the narrow side hasal slo not led to a permanent satisfactory resu t.

method of manufacture which is not suitable for mass production'and theunfavorablecleaning possibility, the cross-section of trixbar pushedtogether. 7 V I Fig. 3 is a view of the closed broad side the matrix barat the connecting place isv too weak to comply with the working requirements.

[Thepresent invention has for its object I of the same .part of thematrix bar when pushed together.

. Fig. l'is a cross-section onthe line Ive-TV through the part ofthematrix bar shownin Figures 1-3. V

The three-sided guiding sleeve 2 is secured,

for instance, 'by rivets to the, upper end of the steel bar .1 bearingthe characters in its extension. The two narrow sides of the sleeve 2areibent so as toserve as a guide for the dovetailed sides of the lowerend of the upper-steel bar 3 bearing the suspending eye ,andadapted to'move longitudinally in the sleeve; There is secured approximately inthe .middleof the guiding sleeve 2 and on its broad side a pin 5t withastraight surface, that is to say a pinof cylindrical forprisaimaticshape. This pin & extendsin the slot 5 Regardless of the moreexpensive,

most positions of the movable part 3 are limited by the said pin andslot arrangement. There is suflicient play between the pin l and thesides of the slot 5 to prevent contact during the slidingmovem'ent. Thelength of the guiding sleeve 2 and that of the slot 5 and of the part 3respectively coincide with each otherso that when the matrix bar ispushed together the gap 6 is left between the two steelparts 1 and 3..The length of the sleeve 2 is such that even when the bar is drawnapart, there is sufficient guiding for the part 3. The bar 3 is providedwith dovetailed narrow sides 7 only over a part of its entire length butthe length of the said sides is such thata sufficiently reliable guidingis ensuredin any position of the parts 1 and 3 relatively to oneanother. A construction of the sides 7 beyond the required extent isprevented by the part 3 above the guides 7 being made narrower at 8 .andwithout lateral guiding members; however, in any case, the length of theguiding members 7 must be greater than that of the slot 5. i

WVithregardto the matrix bar according to the invention importance isattached to the fact that the guiding of the movable partsis noteffected by slot and pin since it has been i found that such guidingdoes not afford any guarantee for, permanent use. The guiding providedin the upper steel bar 3. The outer- V of .thetwo parts is merelyeffected by means of the sleeve 2 secured to one part 1 of the bar andsurrounding the other part 3 of the bar on three sides, the said part 3adapted to move in the sleeve. For the purpose of reducing frictionandensuring the cleaning possibility, the movable bar bears only with-onenarrow slde against the sleeve wh1le owing to the dovetailed members 7it is also guided in the sleeve on both narrow'sides. In this manner, anaccurate and uniform guiding over the-entire path is attained and theparts are also easily movable by maintaining the smallest permissibleplay. The danger of wear and tear which arises with the pin and slotguiding arrangement is .also prevented. by the size of the contactsurfaces. While acsleeve2, the slot and pin are merely used for limitingthe highest and lowest position of the movable part. For this reason andin order not to unnecessarily increase the friction and to preventjamming, the pine does not bear against the walls of the slot 5and sinceit has not to holdthe movable parts 1 [and 3 together, the pin 4 isdesigned with a straight surface for instance, cylindrical or prismatic.In order to reduce as much as possible the detrimental effects of thedirt deposits, the new matrix bar is designed in such a manner that whenthe matrix bar is pushed together, a gap 6 remains between bothrelatively'movable parts 1, 3, and durcording to the new matrix bar, theguiding of r the movable part 3 depends only on the ing the constantreciprocatory movement of one part of the bar, the dirt deposit may becollected in the said gap and easily removed therefrom at any time.

It is also important that the pin 4 is provided approximately inthemiddle of the guiding sleeve 2 so as to ensure in the lowest position ofthe matrix an adequate and good guiding of the movable part 3 of the barabove the pin 4 and the stability of the matrix bar is also ensured inthis position. Notwithstanding the necessary great length of thedovetailed guide according to the new matrix bar, the smallest possiblefriction is obtained since the movable part 3 is provided with only theshortest possible dovetailed guide 7 requisite for'maintaining thestability. The length of this dovetailed guide 7 also depends on thesize of the slot 5 and slightly exceeds the length of the slot so thatthe reduction of the cross-section of the movable part 3 which iseffected by the slot 5 has no detrimental results. The upper portion ofthe movable part 3 of the bar is thiner than the breadth of thedovetailed side guides 7 as is shown at 8.

Owing to this construction, the new matrix bar completely fulfills allthe above-mentioned conditions. Its cross-section is hardlygreater thanthe cross-section of the steel bar even where the means for sliding thebar is provided and in any case the said crosssection is less than thatof the lower part l' earing the characters. Owing to the sleeve 2, whichis provided with a dovetailed guide, being arranged in theabovedescribed manner, the stability of the matrix bar is ensuredwithout the free movement of the parts being prevented by the frictionalconditions and without there being any danger of wear and tear. The tworelatively movable parts 1, 3 are guided with only slight play in aconstantly uniform and satisfactory manner when the matrix bar is pushedtogether or in the extended position and there is no danger of anyamming resulting therefrom. The extent of any friction is reduced to aminimum notwithstanding the very long guiding sleeve 2. The possibilityof a deposit of dirt is diminished by the arrangement of the open broadside but the cleaning possibility is increased especially by providingthe gap 6 so that jamming and working interruptions are avoided. Thearrangement of the dovetailed guide effectively obviates the detrimentaleffects of the crosssectional reduction of the bars owing to the slotsformed therein.

Having thus fully describedthe invention what is claimedas new anddesired to be secured by Letters Patent is:

1. A two-part matrix bar for type line setting and casting machines ofthe type having one part suspended from and guided on a ment includes apin slidably connected to the inner part comprising a three-sided andopen-faced sleeve-like element secured to one'part and arranged I incontacting and sliding engagement with one broad side and the twoopposite and narrow side edges with only very slight play so as to forma guide for the movable part and a pin and slot arrangement between theguide sleeve and the movable part and serving merely for limiting themovement of the matrix bar into its highest and lowest positions.

2. A two-part matrix bar according to claim 1, wherein the cross-sectionof the bar and sleeve at the point of these connecting parts is onlyslightly thicker than the crosssec-tion of the upper movable part of thematrix bar and less than the cross-section ofthe character bearing lowerpart.

3. A two-part matrix bar according to claim 1 wherein the sleeve is openon one broad side while the two narrow sides are dovetailed.

4. A two-part matrix bar accordingto 5. A two-part matrix bar accordingtof claim 1, wherein the pin and slot arrangein the middle of theguiding sleeve so that even in the lowest position of the matrix, thatis to say when the matrix bar is extended, an

adequate guiding which is absolutely reliable on all sides is ensuredfor the part of the bar adapted to move in the sleeve.

6. A two-part matrix bar according to claim 1, wherein the ment includesa slot of such length that a gap remains between both relatively movablepin and slot arrangeprovided approximately parts of the bar even whenthe matrix bar 7 is pushed together, the said gap being adapted toreceive any deposits of dirt which might otherwise hinder the freemovement of the parts of the bar.

7. A two-part matrix bar according to claim 1, wherein the part of thebar which is movable in the sleeve is provided with a dovetailed guideonly over a part of its total length and extending slightly beyond theouter end of the slot while the remaining portion of thebar is reducedso that any unnecessary increase of friction is prevented even in thehighest position of the matrix that is to say when the matrix bar ispushed together.

In testimony whereof I aflix my signature.

- JULIUS DORNETH.

wire, and the other character bearing part if

